Ad Net Zero Expansion Led By Advertisers, Agency Groups, Media & Trade Bodies Companies Invited to Join Global Efforts To Drive Rapid Change Leaders from many of the largest companies and associations in the world's advertising industry have announced their intent to apply learning from the UK and plan the roll out of Ad Net Zero internationally to major markets. The world's major advertising agency holding companies, dentsu international, Havas, Interpublic Group, Omnicom, Publicis Groupe and